reactingFoam problem

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 May 22, 2018, 03:43 reactingFoam problem #1 Member   Jung da yoon Join Date: Nov 2017 Posts: 53 Rep Power: 8 I tried the Sandia d tutorial by using 'reactingFoam'. I found that reactingFoam cannot solve 'radiation heat transfer'. But qr, G were derived as a result. After testing the tutorial, I checked the radiationProperties in constant directory. Sandia d tutorial uses p1 model and radiation model. I can't know why reactingFoam can't solve the radiation heat transfer although the tutorial uses p1 radiation model. Any answer is okay. Thank you

 January 8, 2019, 17:51 Mass conservation issue in Sandia flame Tutorial // OF6 reactingFoam #2 Member   Jeff Join Date: May 2016 Posts: 44 Rep Power: 9 Hi I have been studying this tutorial wich is quite sophisticated. I just added mass flow calculation at all inlet and outlet in the classical way ( function Object in controlDict that sum phi on each patch). . My finding is that there is important mass conservation issue: 1 at iteration 5000 which is the maximum iteration in the original controlDict file, the following inlet and outlet mass give: Code: ```Expression patchMassFlow on inletAir: sum=-0.07559693854 Expression patchMassFlow on inletCH4: sum=-0.002137413754 Expression patchMassFlow on inletPilot: sum=-0.0004322914778 Expression patchMassFlow on outlet: sum=0.102603314``` Adding the inlet mass gives 78.2g In while at the same time 102g are going out The solution is clearly not steady by far at this point. OK reactingFoam is a transient solver so maybe running it longer will help: Increasing the number of iteration dont help the outlet mass fluctuates (a lot) but never stabilise close to the inlet mass and the solver crashes at iteration number 14644. ( and the inlet mass remains constant of courses) So a steady state solution is never reached in this tutorial. I will be working on the side on this tutorial as I have related cases I am interrested in (but these cases have mass conservation...) and I will update this post if I can improve the situation. In the meantime if one of the author of this Tutorial ( or someone else for that matter) could have a look at it, It will be amazing. Sandia flame D is a well known benchmark problem and this is a very sophisticated tutorial.. JF Last edited by jf_vt; January 8, 2019 at 18:11. Reason: better title

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